/*
* Copyright 2002-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.context.config;
import org.w3c.dom.Element;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.util.ClassUtils;
/**
* Parser for the <context:load-time-weaver/> element.
*
* @author Juergen Hoeller
* @since 2.5
*/
class LoadTimeWeaverBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
private static final String WEAVER_CLASS_ATTRIBUTE = "weaver-class";
private static final String ASPECTJ_WEAVING_ATTRIBUTE = "aspectj-weaving";
private static final String ASPECTJ_AOP_XML_RESOURCE = "META-INF/aop.xml";
private static final String DEFAULT_LOAD_TIME_WEAVER_CLASS_NAME =
"org.springframework.context.weaving.DefaultContextLoadTimeWeaver";
private static final String ASPECTJ_WEAVING_ENABLER_CLASS_NAME =
"org.springframework.context.weaving.AspectJWeavingEnabler";
@Override
protected String getBeanClassName(Element element) {
if (element.hasAttribute(WEAVER_CLASS_ATTRIBUTE)) {
return element.getAttribute(WEAVER_CLASS_ATTRIBUTE);
}
return DEFAULT_LOAD_TIME_WEAVER_CLASS_NAME;
}
@Override
protected String resolveId(Element element, AbstractBeanDefinition definition, ParserContext parserContext) {
return ConfigurableApplicationContext.LOAD_TIME_WEAVER_BEAN_NAME;
}
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
builder.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
if (isAspectJWeavingEnabled(element.getAttribute(ASPECTJ_WEAVING_ATTRIBUTE), parserContext)) {
RootBeanDefinition weavingEnablerDef = new RootBeanDefinition();
weavingEnablerDef.setBeanClassName(ASPECTJ_WEAVING_ENABLER_CLASS_NAME);
parserContext.getReaderContext().registerWithGeneratedName(weavingEnablerDef);
if (isBeanConfigurerAspectEnabled(parserContext.getReaderContext().getBeanClassLoader())) {
new SpringConfiguredBeanDefinitionParser().parse(element, parserContext);
}
}
}
protected boolean isAspectJWeavingEnabled(String value, ParserContext parserContext) {
if ("on".equals(value)) {
return true;
}
else if ("off".equals(value)) {
return false;
}
else {
// Determine default...
ClassLoader cl = parserContext.getReaderContext().getResourceLoader().getClassLoader();
return (cl.getResource(ASPECTJ_AOP_XML_RESOURCE) != null);
}
}
protected boolean isBeanConfigurerAspectEnabled(ClassLoader beanClassLoader) {
return ClassUtils.isPresent(SpringConfiguredBeanDefinitionParser.BEAN_CONFIGURER_ASPECT_CLASS_NAME,
beanClassLoader);
}
}
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